00369nam a2200121Ia 4500008004100000082001700041100002200058245008200080260002700162650001800189650001800207700002200225220204s9999    xx            000 0 und d  a581.2bHOR.2  aCOWLING,  Ellis B 0aPlant disease: An advanced treatise. V 2. How disease develops in population.  aLondonbAcademicc1977  aEmigrant pest  aPlant disease  aHORSFALL, James G